@Phaedra when my Enyaq needed a 12 volt battery it took 3 weeks for it to arrive at the dealers. It only took them 5 minutes to fit it when it finally arrived! So I don’t know what the big job is?!!
Unfortunately it didn’t solve any of my issues and in the end the dealer admitted they didn’t know what was wrong with the car after they changed the gateway control module as well. Fortunately Motability have cancelled my contract and I’m currently looking for a replacement.
its strange that the issue is with the cars 12 volt battery. When mine was really playing up I got tonnes (maybe 12) of the battery protection notifications to my phone even though the car was just sitting there. I suspected that something was running in the car when it shouldn’t have been and it was draining the 12 volt battery.
fingers crossed it solves your problems.